Performance Counters in the .NET Compact Framework

.NET Framework Developer's Guide

The .NET Compact Framework does not support PerformanceCounter objects because they do not pertain to Windows CE and the .NET Compact Framework. However, the .NET Compact Framework contains a set of predefined performance counters for analyzing the types of load your application has on the .NET Compact Framework. The counters are not extensible.

You can generate a file on your device that contains performance statistics about your application. For a step-by-step procedure, see How to: Generate Performance Statistics.

The performance counters are useful for understanding the impact of garbage collection and just-in-time compilation on application performance. From these statistics you can determine where optimizations should occur.

The statistics file lists the performance counters with the following columns.

Column	Description
Total	Summation of occurrences.
Last Datum	The last piece of information.
N	The number of occurrences.
Mean	The intermediate between other values.
Min	The minimum value.
Max	The maximum value.

.NET Compact Framework Counters

The performance counters are organized in the following categories:

Loader	JIT compilation
Generics	Exceptions
Locks and threads	Interop
Garbage collection	Networking
Memory	Windows Forms

Loader Counters

The following counters pertain to the portion of the common language runtime (CLR) that is responsible for resolving and loading components that are referenced by your application, such as assemblies and classes.

Name and short name	Description	Counter type
Total Program Run Time (ms) RunTime	The elapsed time, in milliseconds, from CLR invocation.	Calculated
App Domains Created napplication domains	The number of application domains created in the application's process.	Simple
App Domains Unloaded napplication domainsUnloaded	The number of application domains that have been unloaded during the run time of the application.	Simple
Assemblies Loaded nAssembliesloaded	The number of assemblies that have been loaded across all application domains for the application.	Simple
Classes Loaded nClassesloaded	The number of classes that have been loaded across all application domains during the run time of the application.	Simple
Methods Loaded nMethodsloaded	The total count of methods loaded across all application domains during the run time of the application.	Simple

Generics Counters

The generics counters are loader counters that are specific to the generics feature of the compact. The CLR uses generics internally. Consequently, you might see values in these counters even if your application does not use generics explicitly.

Name and short name	Description	Counter type
Closed Types Loaded nInstGenericTypesLoaded	The count of unique generic types that have been loaded across all application domains. A closed type is a generic class that has been bound with a specific data type. For example, an instance of MyGenericType<Int32> is a closed type.	Simple
Closed Types Loaded per Definition nMaxClosedTypes	The maximum number of unique generic types created for a given definition across all application domains. For example, if an application instantiates MyGenericType<Int32>, MyGenericType<String>, and MyGenericType<Single>, the number of closed types loaded for the MyGenericType<T> definition is three (3). A large number (several hundred or more) in the Max column can indicate working-set pressure in terms of JIT-compiled code and CLR data structures.	StaticOnly
Open Types Loaded nOpenTypesLoaded	The count of open generic types created across all application domains. An open type is a generic class that has been loaded, but has not been bound with a specific data type. Open types are typically created only in reflection scenarios. For example, loading an instance of MyGenericType<T> by using reflection will increment the Open Types Loaded counter. When the type has been bound, such as in MyGenericType<String>, it becomes a closed type and the Closed Types Loaded counter is incremented. The .NET Compact Framework CLR uses reflection internally and can be the source of the open types. For example, XML serialization and Web services use reflection internally.	Simple
Closed Methods Loaded nInstGenericMethodsLoaded	The count of unique generic methods that have been loaded across all application domains. A closed method is a generic method that has been bound with a specific data type. The type that contains the method may or may not be a generic type. For example, an instance of MyType.ProcessData<Int32>() is a closed method.	Simple
Closed Methods Loaded per Definition nMaxClosedMethods	The maximum number of unique generic methods created for a given definition across all application domains. This counter is very similar to the Closed Types Loaded per Definition counter. Using the following instances of MyType.ProcessData<Int32>(), MyType.ProcessData<String>(), and MyType.ProcessData<Single>() will create three closed methods for the MyType.ProcessData<T>() definition. As with the Closed Types Loaded per Definition counter, a large number (several hundred or more) in the Max column can indicate working-set pressure in terms of JIT-compiled code and CLR data structures.	StaticOnly
Open Methods Loaded nOpenMethodsLoaded	The count of open generic methods created across all application domains. Open methods are typically created only in reflection scenarios. An open method is a generic method that has been loaded, but not bound to a specific type. The .NET Compact Framework runtime uses reflection internally and can be the source of the open methods.	Simple

Name and short name

Description

Counter type

Closed Types Loaded

nInstGenericTypesLoaded

The count of unique generic types that have been loaded across all application domains.

A closed type is a generic class that has been bound with a specific data type. For example, an instance of MyGenericType<Int32> is a closed type.

Simple

Closed Types Loaded per Definition

nMaxClosedTypes

The maximum number of unique generic types created for a given definition across all application domains.

For example, if an application instantiates MyGenericType<Int32>, MyGenericType<String>, and MyGenericType<Single>, the number of closed types loaded for the MyGenericType<T> definition is three (3).

A large number (several hundred or more) in the Max column can indicate working-set pressure in terms of JIT-compiled code and CLR data structures.

StaticOnly

Open Types Loaded

nOpenTypesLoaded

The count of open generic types created across all application domains.

An open type is a generic class that has been loaded, but has not been bound with a specific data type. Open types are typically created only in reflection scenarios.

For example, loading an instance of MyGenericType<T> by using reflection will increment the Open Types Loaded counter. When the type has been bound, such as in MyGenericType<String>, it becomes a closed type and the Closed Types Loaded counter is incremented. The .NET Compact Framework CLR uses reflection internally and can be the source of the open types. For example, XML serialization and Web services use reflection internally.

Simple

Closed Methods Loaded

nInstGenericMethodsLoaded

The count of unique generic methods that have been loaded across all application domains.

A closed method is a generic method that has been bound with a specific data type. The type that contains the method may or may not be a generic type. For example, an instance of MyType.ProcessData<Int32>() is a closed method.

Simple

Closed Methods Loaded per Definition

nMaxClosedMethods

The maximum number of unique generic methods created for a given definition across all application domains.

This counter is very similar to the Closed Types Loaded per Definition counter. Using the following instances of MyType.ProcessData<Int32>(), MyType.ProcessData<String>(), and MyType.ProcessData<Single>() will create three closed methods for the MyType.ProcessData<T>() definition.

As with the Closed Types Loaded per Definition counter, a large number (several hundred or more) in the Max column can indicate working-set pressure in terms of JIT-compiled code and CLR data structures.

StaticOnly

Open Methods Loaded

nOpenMethodsLoaded

The count of open generic methods created across all application domains. Open methods are typically created only in reflection scenarios. An open method is a generic method that has been loaded, but not bound to a specific type.

The .NET Compact Framework runtime uses reflection internally and can be the source of the open methods.

Simple

Locks and Threads Counters

The following counters pertain to threading, locks, timers, and thread pools. These counters can help identify threading-related performance issues by providing data on thread, timer, and lock usage during the run time of your application.

Name and short name	Description	Counter type
Threads in Thread Pool nThreads	The number of threads currently in the thread pool. This counter counts the threads that are started by using the QueueUserWorkItem method. This counter does not include threads that are started by using the Start method.	MinMax
Pending Timers nPendingTimers	The number of timers currently queued.	MinMax
Scheduled Timers nTimersStarted	The number of timers that are currently running or scheduled to run.	Simple
Timers Delayed by Thread Pool Limit nTimersDelayed	The count of timers that have been delayed by the thread pool limit.	Simple
Work Items Queued nWorkItemsQueued	The count of work items queued to the thread pool.	Simple
Uncontested Monitor.Enter Calls nUncontestedMonitor	Count of calls made to the Enter method that were not contested.	Simple
Contested Monitor.Enter Calls nContestedMonitor	Count of calls made to Enter that were contested. In multithreaded applications, if Thread1 is holding a lock and Thread2 needs to access code that is guarded by the lock, the Contested Monitor.Enter Calls counter is incremented.	Simple

Garbage Collection Counters

The following counters pertain to garbage collection operations.

Name and short name	Description	Counter type
Peak Bytes Allocated (native + managed) cbPeakMemUsage	The maximum number of bytes in use by the CLR, including both native and managed memory.	Calculated
Managed Objects Allocated nObjectsAllocated	The count of objects allocated by the garbage collector.	Simple
Unused Managed Objects Allocated nObjectsAllocatedNotUsed	The count of objects allocated that were never used.	Simple
Managed Bytes Allocated cbAllocated	The count of bytes allocated by the garbage collector.	Complex
Unused Managed Bytes Allocated cbAllocatedNotUsed	The count of bytes allocated that were never used.	Complex
Managed String Objects Allocated nStrings	The number of managed string objects allocated by the garbage collector.	Simple
Bytes of String Objects Allocated nStringBytes	The count of bytes of string objects allocated by the garbage collector.	Simple
Garbage Collections (GC) nGC	The number of times the garbage collector has run.	Simple
Bytes Collected by GC cbGarbage	The count of bytes collected by the garbage collector.	Complex
Managed Bytes in Use After GC cbLive	The number of bytes allocated to live objects after the last garbage collection.	MinMax
Total Bytes in Use After GC cbWorkingSetMem	The number of bytes of memory, native and managed, in use after the last garbage collection.	MinMax
GC Compactions nCompactions	The number of times the garbage collector has compacted the heap.	Simple
Code Pitchings nPitches	The number of times the garbage collector has discarded JIT-compiled code.	Simple
Calls to GC.Collect nInduced	The number of times the application has called the Collect method.	Simple
GC Latency Time (ms) msLatency	The total time, in milliseconds, that the garbage collector has taken to collect objects and compact the heap. The latency time of the garbage collector includes the time to collect managed objects that are no longer in scope and the compaction time, if necessary, of the garbage collector heap.	Complex
Pinned Objects nPinned	The count of pinned objects encountered while performing a garbage collection. Pinned objects are objects whose locations in memory cannot change. For example, a memory buffer that is being used to communicate between managed and unmanaged code is a pinned object. Pinned objects cannot be moved by the garbage collector during heap compaction.	Simple
Objects Moved by Compactor nObjMoved	The count of objects moved by the garbage collector during a compaction.	Simple
Objects Not Moved by Compactor nObjNotMoved	The count of the objects that were not moved by the garbage collector during a compaction. Objects might not be moved for a number of reasons. Some objects cannot be moved, but these objects are rare. Other objects are not moved because they are in a portion of the heap that does not need to be compacted.	Simple
Objects Finalized nFinalizersRun	The count of objects for which a finalizer has been run.	Simple
Boxed Value Types nBoxes	The number of value types that have been boxed.	Simple

Memory Counters

The following counters pertain to the memory heaps managed by the garbage collector.

Name and short name	Description	Counter type
Process Heap HeapDefault	The number of bytes currently in use by the CLR's default heap. The Process Heap contains memory allocated by the CLR that does not fit into the other heaps listed in this table.	MinMax
Short Term Heap HeapShortTerm	The number of bytes currently in use by the CLR's short-term heap. The Short Term Heap contains memory allocated by the CLR for temporary use.	MinMax
JIT Heap HeapJitCodeBuffer	The number of bytes in use by the JIT compiler's heap. The JIT Heap contains the native code generated when the .NET Compact Framework JIT compiler compiles a managed method. JIT compilation occurs whenever a managed method is executed for the first time, or the first time a method is executed after code is discarded.	MinMax
App Domain Heap HeapAppDomain	The number of bytes in use by the CLR's application domain heap. The App Domain Heap contains the dynamic representation of metadata used by the CLR's assembly loader.	MinMax
GC Heap HeapGC	The number of bytes in use by the garbage collector heap. The GC Heap contains memory allocated by applications and the .NET Compact Framework.	MinMax

Name and short name

Description

Counter type

Process Heap

HeapDefault

The number of bytes currently in use by the CLR's default heap.

The Process Heap contains memory allocated by the CLR that does not fit into the other heaps listed in this table.

MinMax

Short Term Heap

HeapShortTerm

The number of bytes currently in use by the CLR's short-term heap.

The Short Term Heap contains memory allocated by the CLR for temporary use.

MinMax

JIT Heap

HeapJitCodeBuffer

The number of bytes in use by the JIT compiler's heap.

The JIT Heap contains the native code generated when the .NET Compact Framework JIT compiler compiles a managed method. JIT compilation occurs whenever a managed method is executed for the first time, or the first time a method is executed after code is discarded.

MinMax

App Domain Heap

HeapAppDomain

The number of bytes in use by the CLR's application domain heap.

The App Domain Heap contains the dynamic representation of metadata used by the CLR's assembly loader.

MinMax

GC Heap

HeapGC

The number of bytes in use by the garbage collector heap.

The GC Heap contains memory allocated by applications and the .NET Compact Framework.

MinMax

JIT Compilation Counters

The following counters pertain to JIT compiler operations.

Name and short name	Description	Counter type
Native Bytes Jitted cbJittedNative	The count of bytes of native code generated by the JIT compiler.	Complex
Methods Jitted nMethodsJitted	The count of methods generated by the JIT compiler.	Simple
Bytes Pitched cbPitched	The count of bytes of native code generated by the JIT compiler that have been discarded.	Complex
Methods Pitched nMethodsPitched	The count of methods generated by the JIT compiler that have been discarded. Unless your application was moved to the background during its run time, any positive value for the Methods Pitched counter indicates that the application ran under memory pressure.	Simple
Method Pitch Latency Time (ms) msPitchLatency	The total time, in milliseconds, spent discarding methods generated by the JIT compiler.	Complex

Exceptions Counters

The following counters pertain to exceptions.

Name and short name	Description
Exceptions Thrown nExceptions	The count of managed exceptions that have been thrown. Because throwing an exception consumes significant resources, tracking the number of exceptions thrown by your application can help identify potential design issues.

Name and short name

Description

Exceptions Thrown

nExceptions

The count of managed exceptions that have been thrown.

Because throwing an exception consumes significant resources, tracking the number of exceptions thrown by your application can help identify potential design issues.

Interop Counters

The following counters pertain to interoperability with native code.

Name and short name	Description	Counter type
Platform Invoke Calls nPInvoke	The count of platform invoke calls from managed code to native code, excluding internal CLR platform invoke calls.	Simple
COM Calls Using a vtable nComVTable	The count of calls from managed code to native code using the COM interop vtable method.	Simple
COM Calls Using IDispatch nComIDispatch	The count of calls from managed code to native code using the COM interop IDispatch method.	Simple
Complex Marshaling nMarshal	The number of objects marshaled from managed code to native code that involved copying or transforming the data.	Simple
Runtime Callable Wrappers cTotalRcw	The total count of COM runtime callable wrappers that have been created. Runtime callable wrappers are created when managed code running on the .NET Compact Framework runtime calls into an unmanaged COM object.	Simple

Networking Counters

The following counters pertain to network send and receive operations.

Name and short name	Description	Counter type
Socket Bytes Sent nBytesSent	The total count of bytes sent over sockets.	Simple
Socket Bytes Received nBytesReceived	The total count of bytes received over sockets.	Simple

Name and short name

Description

Counter type

Socket Bytes Sent

nBytesSent

The total count of bytes sent over sockets.

Simple

Socket Bytes Received

nBytesReceived

The total count of bytes received over sockets.

Simple

Windows Forms Counters

The following counters pertain to the System.Windows.Forms namespace.

Name and short name	Description	Counter type
Controls Created nControlsCreated	The total number of controls created by the application.	Simple
Brushes Created nBrushesCreated	The total number of brush objects created by the application.	Simple
Pens Created nPensCreated	The total number of pen objects created by the application.	Simple
Bitmaps Created nBitmapsCreated	The total number of bitmap objects created by the application.	Simple
Regions Created nRegionsCreated	The total number of region objects created by the application.	Simple
Fonts Created nFontsCreated	The total number of font objects created by the application.	Simple
Graphics Created (FromImage) nGraphicsFromImage	The total number of graphics objects created by the FromImage method.	Simple
Graphics Created (CreateGraphics) nGraphicsCreateGraphics	The total number of graphics objects created by the CreateGraphics method.	Simple

Tasks

How to: Generate Performance Statistics

Other Resources

Performance and Diagnostics in the .NET Compact Framework